The ath_rate_sample function in the ath_rate/sample/sample.c sample code in MadWifi before 0.9.3 allows remote attackers to cause a denial of service (failed KASSERT and system crash) by moving a connected system to a location with low signal strength, and possibly other vectors related to a race condition between interface enabling and packet transmission.
Exploitability
AV:NAC:MAu:NImpact
C:NI:NA:C7.1/AV:N/AC:M/Au:N/C:N/I:N/A:C